1 Centre for Paediatric Inherited and Rare Cardiovascular Disease, Zayed Centre for Research, University College London, 20 Guilford Street, London WC1N 1DZ, UK.
2 Centre for Inherited Cardiovascular Diseases, Great Ormond Street Hospital, Great Ormond Street, London WC1N 3JH, UK.
3 Arrhythmia Section, Department of Cardiology, Hospital Clínic, Universitat de Barcelona, C/ del Rosselló, 149, L'Eixample, 08036, Barcelona, Spain.
4 IDIBAPS, Institut d'Investigació August Pi i Sunyer (IDIBAPS), Barcelona, Spain.